Line The hardware by which data flow into or out of a device
Lineage of data The “family tree” of data. Data are transformed in many ways as they
pass through a system. The lineage is a record of the transformations of data from the
moment they enter a system until they are used in analysis.
Link The mechanism by which two systems or two environments form a common
relationship
Linux An operating system
Load utility A utility provided by a DBMS vendor in which data are efficiently loaded
into the DBMS
Lock The means by which data are protected from update process while the transaction
that is updating the data is in execution
Log A journal of activities
Log tape A sequential record of the activities that have occurred inside a system.
Sometimes called a “journal” tape. The primary purpose of a log tape is for backup and
recovery of a system
Machine cycle A full cycle of processing inside a computer
Magnetic tape An early sequential storage mechanism
Mainframe The monolithic processors produced by IBM and Amdahl
Mapping The instructions to textual ETL as to how to interpret a document or type of
document
MapReduce A language for processing big data
MDM Master data management—the set of processes used to create and maintain a
consistent view, also referred to as a master list, of key enterprise reference data. These
data include such entities as customers, prospects, suppliers, employees, products,
services, assets, and accounts. They also include the groupings and hierarchies associated
with these entities
Glossary